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b63a1dda63
Such operation is almost equivalent to writing on an Inode, so lock the Inode m_inode_lock exclusively. All FileSystem Inode implementations then override a new method called truncate_locked which should implement the actual truncating.
82 lines
3.3 KiB
C++
82 lines
3.3 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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* Copyright (c) 2022-2023, Liav A. <liavalb@hotmail.co.il>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <Kernel/FileSystem/Inode.h>
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#include <Kernel/FileSystem/OpenFileDescription.h>
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#include <Kernel/FileSystem/ProcFS/Definitions.h>
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#include <Kernel/FileSystem/ProcFS/FileSystem.h>
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#include <Kernel/Library/KBufferBuilder.h>
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#include <Kernel/UnixTypes.h>
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namespace Kernel {
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struct ProcFSInodeData : public OpenFileDescriptionData {
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OwnPtr<KBuffer> buffer;
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};
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class ProcFSInode final : public Inode {
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friend class ProcFS;
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public:
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enum class Type {
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RootDirectory,
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SelfProcessLink,
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ProcessProperty,
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ProcessDirectory,
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ProcessSubdirectory,
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};
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static InodeIndex create_index_from_global_directory_entry(segmented_global_inode_index entry);
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static InodeIndex create_index_from_process_directory_entry(ProcessID pid, segmented_process_directory_entry entry);
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virtual ~ProcFSInode() override;
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private:
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ProcFSInode(ProcFS const&, InodeIndex);
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ProcFS& procfs() { return static_cast<ProcFS&>(Inode::fs()); }
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ProcFS const& procfs() const { return static_cast<ProcFS const&>(Inode::fs()); }
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// ^Inode (EROFS handling)
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virtual ErrorOr<NonnullRefPtr<Inode>> create_child(StringView, mode_t, dev_t, UserID, GroupID) override { return EROFS; }
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virtual ErrorOr<void> add_child(Inode&, StringView, mode_t) override { return EROFS; }
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virtual ErrorOr<void> remove_child(StringView) override { return EROFS; }
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virtual ErrorOr<void> replace_child(StringView, Inode&) override { return EROFS; }
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virtual ErrorOr<void> chmod(mode_t) override { return EROFS; }
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virtual ErrorOr<void> chown(UserID, GroupID) override { return EROFS; }
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virtual ErrorOr<size_t> write_bytes_locked(off_t, size_t, UserOrKernelBuffer const&, OpenFileDescription*) override { return EROFS; }
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virtual ErrorOr<void> truncate_locked(u64) override { return EROFS; }
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// ^Inode (Silent ignore handling)
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virtual ErrorOr<void> flush_metadata() override { return {}; }
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virtual ErrorOr<void> update_timestamps(Optional<UnixDateTime>, Optional<UnixDateTime>, Optional<UnixDateTime>) override { return {}; }
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// ^Inode
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virtual ErrorOr<void> attach(OpenFileDescription& description) override;
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virtual void did_seek(OpenFileDescription&, off_t) override;
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ErrorOr<void> traverse_as_root_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const;
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virtual ErrorOr<void> traverse_as_directory(Function<ErrorOr<void>(FileSystem::DirectoryEntryView const&)>) const override;
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virtual InodeMetadata metadata() const override;
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virtual ErrorOr<size_t> read_bytes_locked(off_t, size_t, UserOrKernelBuffer& buffer, OpenFileDescription*) const override;
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ErrorOr<NonnullRefPtr<Inode>> lookup_as_root_directory(StringView name);
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virtual ErrorOr<NonnullRefPtr<Inode>> lookup(StringView name) override final;
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ErrorOr<void> refresh_process_property_data(OpenFileDescription& description);
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ErrorOr<void> try_fetch_process_property_data(NonnullRefPtr<Process>, KBufferBuilder& builder) const;
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Type m_type;
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Optional<ProcessID> const m_associated_pid {};
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u16 const m_subdirectory { 0 };
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u32 const m_property { 0 };
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mutable Mutex m_refresh_lock;
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};
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}
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